Thread-controlling mechanism for sewing-machines.



D. MILLS.

v THREAD CONTROLLING MECHANISM FOR SEWING MACHINES.

, APPLICATION FILED MAR. 17, 1898.

2 SHEETS-SHEET 1.

INVENTOR WITNESSES: I ivy/WK: "E-

A I 41;, BY

I i Q I a *.%Ql

M ATTORNEY PATENTED AUG. 18, 1908.

D. MILLS.. THREAD CONTROLLING MECHANISM EOE SEWING MACHINES.

APYLIOATION FILED MAR.17,1898.

2 SHEETS-SHEET 2.

WITNESSES g INVENTOR Q L a "1K $ouv-I- M ATTORNEY DANIEL MILLS, OF PHILADELPHIA,

UNITED STATES PATENT OFFICE.

PENNSYLVANIA, ASSIGN OR TO MAOHINEDOMPANY, OF CLEVELAND, OHIO, A CORPORATIONOF OHIO.

THREADOONTROLLIN MEOHANISM FOR SEWING-MACHINES.

I ing machines employing a shuttle or looper for carrying the needle thread loop around a bobbin to interlock with the under or bobbin thread and form a lock-stitch. It is desirable in this class of machines that some means be provided for pulling off a sufficient amount of thread from the bobbin as may be required for each stitch, and present the same in V a slack condition to the needle thread loop whereby it may be taken up by the latter without undue strain thereon in completing the stitch. Having this in the formation 0 bobbin threadf Figs. 3

mind, it has been the object of my present invention to provide a simple means for pulling the thread from the bobbin, that may be adjusted to (pull off any desired length of thread accor ing to the-character of the work or thickness of the material being operated upon, and which will also 0 erate without possibility of interfering wit the needle or needle thread. This object I secure by means of the construction and arrangement of parts embodying my invention as hereinafter set forth in detail and pointed out in the claims.

Referring to the accompanying drawings, Figure 1 is a bottom view of the bed-platev of a sewing machine embodying my invention, with the shuttle, shuttle-race frame, and their supporting hanger removed. Fig. 2' is a vertical section of a portion of the machine, taken through line 2--2 of Fig. 1, with the shuttle and ts race frame in position, showing the relative ositions of the parts during f a stitch with t e needle at its lowest point and the pull-ofi engaging the and 4 are detail views to be hereinafter referred to.

To explain in detail: (t represents a portion Specification of Letters Patent. Application filed March 17, 1898. Serial No. 674,155.

with the pull-offb, and at its opp Patented Aug. 18, 1908.

of the bed-plate of a sewing machine, a a rotating shuttle su ported Within a raceway casement a 'w 1ch is located within a hanger a on the under side of the bedlate,

and a, a driving shaft arranged beneat the v,bed-plate -for operating the shuttlea. The

above and ard sew ng machine, to which, as herein shown, I have applied my invention.

According to my present invention, a bobbin-thread pull-off in-the form of an. elbow lever b is pivotally secured to the under side parts are of the usual construction of the needle plate a by means of a in or screw 1), in a position so that the en 6 of one of its arms will move in a path at one side of the vertical path of the needle a and engage with the bobbin thread Z, when being operated as. willv hereinafter be .described. In the machine illustrated, the front edge of the shuttle projects forward of the needle so that thebobbin thread in passing over the said front edge of the'shuttle between the bobbin and. the needle opening in v the needle plate aiis held well forward or at one side of the path of the needle, as clearly the path of THE STANDARD SEWING arrangement as found in the Standshownin Fig 1, to permit the said pull-off b to readily engage therewith without the necessity of crossing the path of the needle or otherwise interfering with the latter or the needle thread.

The pull-off b is adapted to be operated to alternately engage with the bobbin thread and draw a certain regulated amountof the same from the bobbin; and then release such thread to leave the same in a slack condition to be taken up by the upper thread, by any suitable actuating means, the means as herein shown being as follows: A rod or bar 0,

supported to have a longitudinally reciprocatin movement on the under side of the bed-gate of the machine, is arranged with one end extending in a end has a hinged connection with a pivoted lever d, which latter is arranged at substan-' tially right angles to the driving shaft (2 and is ivotally secured at one end to the under side of the bed-plate b a in or screw d. This lever d is provided a stud orpin position for engaging osite or rear ing an adjusting screw the other co acti starting position of the descent of the engaging arm engage with ing possibility of co I ull-off arm .mains stationa' about to cast off the 'in a slac T thereby give the connected rod 0 a longitudinally reciprocating movement;

The rod 0, which rests upon the upper surface of the shuttle'race-way casement a? to be supported and uided thereon, is provided with a downwar y turned portlon'c at its front end hav- 0 sugpprted thereby for engaging .wlth the pull-o which latter is also provided with a downwardly turned flange b to form an enlarged bearing surface .to receive the engagement of the said screw 0 When-the .rod 0 is moved in one direction, it acts upon the pull-off b to cause its 7 thread enga ing end or arm I) to engage with the bobbin't ead and draw a certain amount ofthe same from the bobbin, vand as said rod is moved back or in the opposite direction, the pull-off b is also returned to its normal to disengage with the bobbin thread, under the action of a' spring f which is connected at one end with a fixed ,pin' on the needle plate and at its opposite end with the said pull-01f b. This s ring holds the lever b in contact with the ro 0 so that said pull-off willbe caused tofollow the latter on its return movement after having operated the pull-ofi'. I 'The operation of the pull-off 1) relative to parts of the stitching mechanism, is as fol ows: At the beginnin needle, the threa b'of."the pulloff b is in a position vback from the path of the. needle as shown the said pul x the bobbin thread 1,, its movement being so timed by the cam e that it will have moved forward needle, as shown in Fig. 1, before the needle reaches the plane of; the same, this preventtact betweensuch parts in case theend of thepull-olf should move across the iath of the needle. After the imitto draw the desired amount of thread from the bobbin, as shown in Fi 4, it reuntil the needle ias raised above the'nee l e plate and the shuttle is needle thread loop, at which time it is moved back to its normal starting lposition to leave the bobbin thread. condition to be drawn up into or through the work by the upper thread without undue strain on the latter.

The movement of the pull ofi b may be regulated to draw ofi more or less thread from the bobbin according to the; thickness of the material being 0 erated u on-or the character of the work eing per ormed, by

thereby regulate thedistance o looper,

ofi, andan adjustable 4, but as the needle descends, ofi arm la is moved forward to of the path of the 2 has been moved forward to its f turning the adjustingscrew c in the proper direction so that its ever engaging end will project more or less beyond its su the movementor throw of the pull-oii arm I), which movement, being greater or late the amount of thread drawn from the bobbin as will be obvious. After the'screw c has been properly adjusted it is locked from undue movement by means of a jam nut 0 Having thus set forth my invention, what I claim asnewand desire to secure by Letters Patent, is- V 1. In asewing machine, the combination,

with a reciprocatingneedle, a bobbin, and a I looper, of a bobbin-thread pull-off operative in a pathat one side the path of movement of the needle, ofi, and. an adjustable contact device between the pullmeans for regulating the movement of the pull-01in.

with a reciprocating needle,

of a bobbin-thread pull-off operative in a path at one side the-path of movement of the needle, means 'for actuating said pullactuating means for contact with the pull-ofi 3. In a sewing machine,

with a reciprocating needle,

looper, of a bobbin-thread ull-ofi operative in a path the needle, means for yieldingly holding said pull-.ofi in a normal stationary ormoperative position, means for actuating said OE, and an adjustable contact device be* tween the pull ofi and its said actuating means for regulating themmovementof the pull-off.

4. .Ina sewing machine, with a reciprocating needle, looper, ina path at one side the path of 'movement of the needle, said pull-off in a normal stationary or moperative position, pullofi, and anadjustable device carried by said actuating means pull-off.

- 5. In asewingmachine, with a reciprocating looper, of a pivoted confined to movement of the path of movement of the needle, a reciprocating, rod for engaging with said pull-off to move the same positively in one direction, means for moving said the combination, needle, a bobbin, anda port a and means for yieldingly holding,

means for actuating said for contact with the bobbin-thread pull-off in a path at one side less, will reg-umeans foractuating said pullif and its said actuating,

. a sewing machine, the combination, a bobbin,'and a device carried by said the combination, a bobbin, and a,

pulla the combination, I a bobbin, and a of a bobbine hreadpull-01f operative 1'26 pull-off in the opposite or return direction, an adjust able contact device between said rod and ull-oif, and means ment of the latter.

6. In a sewing machine,

the combination for regulating the move- 95 atone side the pat of movement of i with a reciprocating needle, a bobbin, and a pull-ofl' Iever to move the, same positively in looper, of a bobbin-thread pulleofi in the .one direction and a spring. for moving said form of a pivoted elbow-lever confined to pull-off in the opposite or return direction. 10

movement in a path at one side of the path DANL. MILLS. 5 of movement of the needle for engaging the Witnesses:

b0bbin-thread, a reciprocating rod carrying CHAS. MATHEWS, Jr.,

an adjusting screw for engaging with sai M. WALLACE. 

